1 | initial version |
you can use the userdata ptr in the event handler to do that, here's an example, that passes in a Point, holding the Mouse position
void onmouse( int event, int x, int y, int d, void *ptr )
{
if ( event == 1 ) // lbutton down
{
cv::Point* p = (cv::Point*)ptr;
p->x = x;
p->y = y;
}
}
int main()
{
cv::namedWindow("video", 1);
cv::Point point;
cv::setMouseCallback( "video", onmouse, (void*)(&point) );
// whenever the mouse is clicked, point holds the current value here
return 0;
}